[MachineBasicBlock] Add getFirstNonDebugInstr to complement getLastNonDebugInstr

Use it in CodeGen where applicable. No functionality change intended.

llvm-svn: 240414

1 files changed, 2 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/TailDuplication.cpp b/llvm/lib/CodeGen/TailDuplication.cpp
index 23f41c8dd4b..237460cd905 100644
--- a/llvm/lib/CodeGen/TailDuplication.cpp
+++ b/llvm/lib/CodeGen/TailDuplication.cpp
@@ -627,11 +627,8 @@ TailDuplicatePass::isSimpleBB(MachineBasicBlock *TailBB) {
     return false;
   if (TailBB->pred_empty())
     return false;
-  MachineBasicBlock::iterator I = TailBB->begin();
-  MachineBasicBlock::iterator E = TailBB->end();
-  while (I != E && I->isDebugValue())
-    ++I;
-  if (I == E)
+  MachineBasicBlock::iterator I = TailBB->getFirstNonDebugInstr();
+  if (I == TailBB->end())
     return true;
   return I->isUnconditionalBranch();
 }